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Sit on ground, knees bent, feet flat, arms at sides. Contract abs to lift bent legs to form a 45-degree angle with torso, toes pointed. Raise arms overhead, palms in, for starting position. Twist right, extending right arm straight and left arm across body as you open knees and press bottom of feet together (as shown). Return to start. Repeat, twisting left for one rep. Do eight reps.